Nokia's high-end US Windows Phone, expected to be named next week as the Lumia 900, will reportedly launch as an AT&T hero device. We've heard rumors that the "Ace" handset will land at AT&T on March 18th, but now BetaNews claims the US operator has big plans for the Nokia Windows Phone. A $100 million marketing effort, put together by Nokia, AT&T and Microsoft, will see AT&T give prominent billing for the device across its retail store chain — something Microsoft and Windows Phone fans will be eager to see.

Nokia unveiled a huge marketing blitz across Europe in November for its Lumia 800 smartphone launch, including a 4D light projection show by deadmau5 at London's Millbank Tower. Windows Phones have suffered from a lack of sales...